Why `kapt.mapDiagnosticLocations` is not enabled by default?

Recently I discovered kapt.mapDiagnosticLocations, which is a great addition to kapt and let me discover issues way faster - I’m not sure why this option is not heavily spread. I found it by chance…

Why isn’t this option enable by default? Does it has some type of side effect that I’m not aware of, like slower build times or something?